Skip to main content

Featured

🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!)

🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!) Congratulations, developer! 👏 You’ve successfully completed the 45-Day React.js Roadmap — from understanding the fundamentals to mastering advanced concepts like Redux, Routing, Testing, and Deployment. 📘 What You’ve Learned ✅ React basics — Components, JSX, Props, and State ✅ Hooks — useState, useEffect, useRef, useMemo, and Custom Hooks ✅ Context API and Redux Toolkit for global state management ✅ Routing with React Router & Protected Routes ✅ Data fetching using Fetch API, Axios, React Query ✅ Advanced Patterns — Compound Components, Render Props, HOCs ✅ Styling — CSS Modules, Styled Components, Theming ✅ Animations, Accessibility, Testing, and Performance Optimization ✅ Deployment on Vercel, Netlify, or GitHub Pages 🧩 Final Project Ideas Now that you’re done, build real-world apps to polish your skills: 📝 Task ...
Post a Comment
Read more
Labels

📘 Day 26 — Unit Testing Components

📘 Day 26 — Unit Testing Components

Unit testing ensures individual React components work correctly. Jest is the testing framework, and React Testing Library (RTL) helps simulate user interaction.

🔹 Simple Example

import { render, screen } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import Counter from "./Counter";

test("increments counter when button clicked", () => {
  render(<Counter />);
  userEvent.click(screen.getByText("Increment"));
  expect(screen.getByText("Count: 1")).toBeInTheDocument();
});

💡 Try It Yourself

Jest works out of the box with Create React App. For custom setups, install manually: 

npm install --save-dev jest @testing-library/react @testing-library/jest-dom

Comments

Post a Comment